Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

Each RAID controller module in an MD Series storage array maintains a special virtual disk, called the access virtual disk. The host-agent software uses the access virtual disk to communicate management requests and event information between the storage management station and the RAID controller module in an in-band-managed storage array and cannot be removed without deleting the entire virtual disk, virtual disk group or virtual disk pair. The access virtual disk is not available for application data storage and cannot be removed without deleting the entire virtual disk, virtual disk group, or virtual disk pair. The default LUN is 31.